BRAND NEW key fob working intermittently - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 2 Weeks Ago Thread Starter
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BRAND NEW key fob working intermittently

Hi guys, I decided to buy a brand new key fob for my 2003 GT after the keychain hole snapped on my last one. When I got it, I put brand new batteries in it, and used the 8 crank method to program it.

It programmed and worked fine for a few days and then all of a sudden I started noticing that it wasn’t working every few clicks.. as time went on (about a week) it stopped working completely and will only work 1 out of probably 50 clicks, meaning that I cannot lock my car at night with the risk of not being able to unlock it the next morning (had it happen twice)...

I’ve tried reprogramming 10+ times and nothing I do keeps it working after about 3 button presses. I tried to reprogram the old remote to make sure the new one wasn’t faulty and that one is now having the same issues. Has anyone else had this problem before? Sounds like it might be some sort of wiring on the cars end. Any advice? Thanks!

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post #2 of 5 (permalink) Old 2 Weeks Ago
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Do you have an ODB2 scanner? If you did this might give the diagnostic information that could prove "key" to your problem.

Here's some information on an affordable Windows based unit. The ForScan unit does have the ability to "talk" to the other modules besides the PCM.

ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-for...elm327-usb.57/

In the interest of being through, are you positive that the battery and alternator is in tip top shape?

Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-for...-drop-test.56/


2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #3 of 5 (permalink) Old 2 Weeks Ago Thread Starter
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I have an OBD scan tool, but I don’t see anything that would prevent the fob from working on the live data feed. I do have a brand new battery and I know the alternator is fine. Do you have any idea what I should be looking for (either on the OBD tool or off) that would relate to transmitting to the fob? Thank you for your help.
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post #4 of 5 (permalink) Old 2 Weeks Ago
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Is YOUR ODB2 scan tool able to "talk" to the GEM? There are GEM specific PID's that can be used for trouble shooting. For example, "door open", "door close". The idea is to see IF the GEM is showing the input on the ODB2 scanner when the FOB is used.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #5 of 5 (permalink) Old 2 Weeks Ago Thread Starter
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Mine does not, no. I will have to invest in the one you sent me, as it sounds like I’ll be running in circles forever without it. Thank you so much for your help
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